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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Hemochromatosis, or iron overload disorder, is a disorder which makes the body absorb excessive amounts of iron from the food and drink we consume. The iron overload gives the skin a bronze color, as well as damaging the liver and other organs. Commonly, if it is allowed to progress, the pancreas becomes damaged and the patient develops diabetes. The surplus iron is stored in the liver, heart, pancreas and other organs.